One day, Hikari Kisaki received an unexpected confession of love from her brother-in-law, Hajime, while he was visiting them in Tokyo. Hajime had come to town for some reason related to his cooperative farm business, which he inherited after their older brother got married and moved away. As they were discussing this, Hajime revealed that he has always harbored feelings for Hikari. Despite being shocked by the revelation, Hikari couldn't help but feel flattered and aroused by her younger brother-in-law's advances.

夫の実家から弟のハジメが上京してきた。ハジメは次男だが、長男である夫の代わりに、実家の田畑を継いで農業に従事していて、今回は協同組合の会合か何かでしばらく都内に滞在するとの事で、都内マンションで暮らす兄夫婦のところで寝泊まりしていく旅程での上京だった。そんなある日ハジメから真顔で相談を受けた兄嫁ひかり。「実は姉さん…僕、姉さんの事が好きだったんです…」と、義弟からの思わぬ告白求愛をされてしまい…。